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Transit and non-transit theodolite.
Varies according to instrument. There are differing scales and degrees of precision. Look up any catalog on surveying instruments and you will get some information, maybe more than you need, but you will get an idea. There are all different types, some heavily electronic
least count for micrometer is 0.01mm0.01 mm
The least count of the micrometer screw can be calculated using the formula given below: Least count = 0.01 mm
digital micrometer least count calculation